No such module 'UIImage_Spectrogram'

[naughtont]

I'm seeing some compiler errors on Xcode 13.3

/Users/tom/projects/Audio/iOS-Spectrogram/UIImage+Spectrogram/EasyImagy/Util.swift:41:15: Invalid redeclaration of 'countableRange(from:relativeTo:)'
/Users/tom/projects/Audio/iOS-Spectrogram/UIImage+Spectrogram/EasyImagy/Util.swift:33:15: 'countableRange(from:relativeTo:)' previously declared here
/Users/tom/projects/Audio/iOS-Spectrogram/UIImage+Spectrogram/EasyImagy/Util.swift:45:15: Invalid redeclaration of 'countableRange(from:relativeTo:)'
/Users/tom/projects/Audio/iOS-Spectrogram/UIImage+Spectrogram/EasyImagy/Util.swift:37:15: 'countableRange(from:relativeTo:)' previously declared here

If I delete those methods it builds.But the playground gives me this error:

No such module 'UIImage_Spectrogram'

I tried renaming UIImage+Spectrogram to UIImage_Spectrogram everywhere. So far no luck.